CN105764201A

CN105764201A - Color temperature adjusting control circuit

Info

Publication number: CN105764201A
Application number: CN201610299421.8A
Authority: CN
Inventors: 涂才根; 黄飞明; 赵文遐; 励晔; 朱勤为; 吴霖
Original assignee: WUXI SI-POWER MICRO-ELECTRONICS Co Ltd
Current assignee: WUXI SI-POWER MICRO-ELECTRONICS Co Ltd
Priority date: 2016-05-04
Filing date: 2016-05-04
Publication date: 2016-07-13
Anticipated expiration: 2036-05-04
Also published as: CN105764201B

Abstract

The invention provides a color temperature adjusting control circuit.The color temperature adjusting control circuit comprises a power supply module, a cycle counter, an AND gate (AND1), an oscillator (OSC), an INV gate (INV1), a multiplexer (MUX1) and a multiplexer (MUX2), wherein the power supply module is used for generating a power supply VDD of the cycle counter and a clock signal (clk); the enabled end of the cycle counter is connected with the clock signal (clk), one output end of the cycle counter is connected with one input end of the AND gate (AND1) and the first input end of the multiplexer (MUX1), and the other output end of the cycle counter is connected with the other input end of the AND gate (AND1) and the first input end of the multiplexer (MUX2); the enabled end of the oscillator (OSC) is connected with the output end of the AND gate (AND1), enable (EN) of the oscillator is generated by the AND gate (AND1), and when the enable (EN) of the oscillator is high, a pulsed square wave signal is output; the output (out1) of the oscillator (OSC) is connected with the second input end of the multiplexer (MUX1) and connected with the second input end of the multiplexer (MUX2) through the invert-phase output (out2) of the INV gate (INV1).According to the color temperature adjusting control circuit, the brightness of LED lamps on two ways is balanced.

Description

Color-temperature regulating control circuit

Technical field

The present invention relates to LED drive circuit, particularly relate to a kind of color-temperature regulating control circuit.

Background technology

Along with the continuous expansion in LED illumination market, the experience of LED illumination is required also more and more higher by people, and various new LED technology are arisen at the historic moment, and LED color-temperature regulating technology is also rapidly developed in recent years.The color-temperature regulating scheme of early stage is by using MCU to realize, but scheme is relatively costly.In prior art, switch color-temperature regulating scheme obtains the consistent favor of client, extremely convenient in operation, and without transforming original illuminating switch system.

Fig. 1 is the rough schematic view of the adjustable color temperature LED drive circuit of prior art, as it can be seen, AC is input AC electricity；K1 is switch on wall；D1～d4 forms rectifier bridge；C0 is filter capacitor, together with rectifier bridge, AC rectification is filtered into unidirectional current；IC1 is LED constant current control chip；Former limit NP, secondary NS form transformator；MOSFET is power tube；R1 is primary current sampling resistor；D5, d6 are one-way conduction diode；C3 is output capacitance；IC2 is color-temperature regulating chip；R2, C2 are IC2 power supply circuits；C1 is the storage capacitor of VDD foot；M1, M2 are the control power tube of two paths of LED lamp.

Color-temperature regulating chip IC 2 is internal schematically illustrates two modules, supply module produces power vd D and clock signal clk, VDD provides power supply for cycle counter, and clk provides clock for cycle counter, and two output SW1 and SW2 of cycle counter drive M1 and M2 respectively.

Operation principle: switch K1 first time conducting, IC2 starts, and supply module provides power vd D and clock clk for cycle counter, and cycle counter output SW1 is high, and SW2 is low, and the first street lamp is bright, and the second street lamp goes out；Switch OFF, IC2 is power down also, and clk disappears, and VDD is able to maintain that a period of time due to the existence of outside storage capacitor, during this period of time internal recycle counter works keep state；Until switching K1 second time and turning on, cycle counter obtains second time clock, then output SW1 is low, and SW2 is high, and the first street lamp goes out, and the second street lamp is bright；The rest may be inferred, and third time switch conduction, two street lamps are bright；4th switch conduction, is returned to the first street lamp bright.

But, the conduction voltage drop of LED lamp bead is not fixing, though the lamp bead of same batch, also can because of the difference of colour temperature, lamp bead pressure drop is different, say, that the pressure drop of cold light LED lamp string and warm light LED string is different.For single channel lamp bright time, LED current is controlled by current constant control chip IC 1, has same current, same brightness；But for two street lamps simultaneously bright time, IC1 ensure that two-way lamp current sum is fixed, but owing to the conduction voltage drop of at this moment two street lamps is inconsistent, the electric current of this two street lamp there are differences, and user is it can be seen that the brightness of two street lamps is inconsistent, one street lamp is brighter, and another road is substantially very dark, and experience is poor.

Summary of the invention

For the defect overcoming prior art to exist in Consumer's Experience, the invention provides a kind of color-temperature regulating control circuit, it is possible to solve color-temperature regulating technology deficiency on Consumer's Experience so that the luminance proportion of two paths of LED lamp；The technical solution used in the present invention is:

A kind of color-temperature regulating control circuit, including a supply module, in order to produce the power vd D and clock signal clk of cycle counter；Also include:

Cycle counter and door AND1, agitator OSC, not gate INV1, selector MUX1 and MUX2；

The enable termination clock signal clk of cycle counter, an input of an output termination and door AND1 and the first input end of selector MUX1, another exports the first input end of termination another input with door AND1 and selector MUX2；

The output enabling termination and door AND1 of agitator OSC, the enable EN of agitator is produced by with door AND1, when agitator enable EN is high, exports pulse square wave signal；The output out1 of agitator OSC connects second input of selector MUX1, and output out1 connects second input of selector MUX2 by not gate INV1 output out2 after anti-phase；

The end that selects of selector MUX1 and MUX2 is all connected with and the outfan of door AND1, namely selector MUX1 and MUX2 select signal from the output with door AND1；

During the selection end input low level of selector MUX1 and MUX2, outfan equal gating each first input end of selector MUX1 and MUX2, during the selection end input high level of selector MUX1 and MUX2, outfan equal gating each second input of selector MUX1 and MUX2.

Further,

The cycle of agitator is less than the retentivity time of eye of human eye.

It is an advantage of the current invention that: this color-temperature regulating control circuit, needs control two paths of LED lamp simultaneously turn on time, the quick alternate conduction of two paths of LED lamp can be made, persist effect by means of human eye, human eye can not be identified two paths of LED lamp and alternately lighting, and will be considered that two paths of LED lamp is simultaneously bright.And the design within color-temperature regulating control circuit, improve original circuit structure, both LED color-temperature regulating application circuit in compatible existing Fig. 1, when making again two paths of LED lamp turn on, existing LED constant current control chip IC1 individually controls two paths of LED lamp Zhong mono-tunnel of alternate conduction, so that the LED that two-way is alternately lighted, its electric current is identical, and brightness is identical.

Accompanying drawing explanation

Fig. 1 is the rough schematic view of the LED color-temperature regulating circuit of prior art and application scheme.

Fig. 2 is the color-temperature regulating control circuit inner frame rough schematic view of the present invention.

Detailed description of the invention

Below in conjunction with concrete drawings and Examples, the invention will be further described.

Fig. 2 is the color-temperature regulating control circuit schematic internal view shown by the present embodiment, including: a supply module, in order to produce the power vd D and clock signal clk of cycle counter；

Also include: cycle counter and door AND1, agitator OSC, not gate INV1, selector MUX1 and MUX2；

The end that selects of selector MUX1 and MUX2 is all connected with and the outfan of door AND1, and namely the selection signal of selector MUX1 and MUX2 is from the output with door AND1, the namely enable EN of agitator；

Outfan SW1 and the SW2 of two selector MUX1 and MUX2, for controlling two paths of LED lamp respectively, circuit that can be identical as shown in fig. 1 controls power tube M1, M2 respectively through two and connects two paths of LED lamp.

The operation principle of the present invention is below described in two kinds of situation:

The first, turning on situation, the output of cycle counter or A=1, B=0 or A=0, B=1 for single LED lamp, be now output as 0 with door AND1, agitator OSC does not work.For two selectores, when selecting signal S=0, output selects A1 end (first input end), it can be seen that the A1 end of two selectores connects two outfans of cycle counter.For this situation, like the prior art, reality is controlled two paths of LED lamp by the two of cycle counter outfans, but at this moment only a street lamp can be bright.

The second, for two street lamps simultaneously bright time, two outputs A=1, B=1 of cycle counter, also being high level with door AND1 output, say, that the enable signal EN of agitator OSC is high level, agitator OSC works, output out1, out2 signal, for two selectores, select signal S to connect and enable EN, high level, so A2 end (the second input) is all selected in the output of two selectores, namely selects out1 and out2 signal respectively.Out1 and out2 is mutually opposing signal, and waveform is illustrated out at Fig. 2, and out1 and out2 driven two paths of LED lamp, at this moment two paths of LED lamp alternate conduction, the cycle of alternate conduction was determined by the cycle of agitator.In design, it is only necessary to reasonable by the cycle design of agitator, less than the retentivity time of eye of human eye, the cycle such as agitator is 1ms, then two paths of LED lamp was alternately lighted by the cycle of 1ms.Here by means of the effect that persists of human eye, human eye can not be identified two paths of LED lamp and alternately lighting, and will be considered that two paths of LED lamp is simultaneously bright.When two paths of LED lamp is alternately lighted, the bright LED current of any waypoint is all controlled by the current constant control chip IC 1 before in Fig. 1, say, that the LED that two-way is alternately lighted, its electric current is identical.User will be considered that two street lamps are lighted simultaneously, and brightness is identical.

In sum, this color-temperature regulating control circuit is compatible existing LED color-temperature regulating technology both, the problem that can solve poor user experience well again.

Description of the invention and application are illustrative, not as limiting the scope of the invention in above-described embodiment.The deformation of embodiment here and change are possible, and all those skilled in the art, all should be within the scope of the invention under this invention's idea by the available technical scheme of logical analysis, reasoning, or a limited experiment.

Claims

1. a color-temperature regulating control circuit, including a supply module, in order to produce the power vd D and clock signal clk of cycle counter；It is characterized in that, also include:

2. color-temperature regulating control circuit as claimed in claim 1, it is characterised in that:

The cycle of agitator is less than the retentivity time of eye of human eye.

3. color-temperature regulating control circuit as claimed in claim 2, it is characterised in that:

The cycle of agitator is 1ms.